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AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R010 CLI-based Configuration Guide - MPLS

This document describes MPLS features on the device and provides configuration procedures and configuration examples.

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Example for configuring LDP extension for inter-area LSP

Example for configuring LDP extension for inter-area LSP

Networking Requirements

On a large network, multiple IGP areas need to be configured for flexible network deployment and fast route convergence. When advertising routes between IGP areas, to prevent a large number of routes from consuming too many resources, an Area Border Router (ABR) needs to aggregate the routes in the area and advertises the aggregated route to the neighboring IGP areas. By default, when establishing LSPs, LDP searches the routing table for the route that exactly matches the FEC in the received Label Mapping message. If the route is an aggregated route, LDP establishes only a liberal LSP, not an inter-area LSP.

As shown in Figure 3-37, IS-IS runs between devices. Two IGP areas Area 10 and Area 20 exist. LSRD aggregates routes from LSRB and LSRC and sends the aggregated route to Area 20. Two inter-area LSPs need to be established: one is from LSRA to LSRB and the other is from LSRA to LSRC.

Figure 3-37  Networking diagram for configuring LDP extension for inter-area LSP

Configuration Roadmap

To meet the preceding requirements, configure LDP extension for inter-area LSP. The configuration roadmap is as follows:

Configure LDP extension for inter-area LSP on LSRA to enable LDP to search for a route according to the longest match rule to establish an LDP LSP.

Procedure

  1. Configure IP addresses for interfaces.

    # Configure LSRA. The configurations of LSRB, LSRC, and LSRD are similar to the configuration of LSRA, and are not mentioned here.

    <Huawei> system-view
[Huawei] sysname LSRA
[LSRA] interface loopback 0
[LSRA-LoopBack0] ip address 10.1.0.1 32
[LSRA-LoopBack0] quit
[LSRA] interface gigabitethernet 1/0/0
[LSRA-GigabitEthernet1/0/0] ip address 10.1.1.1 24
[LSRA-GigabitEthernet1/0/0] quit

  2. Configure basic IS-IS functions.

    # Configure LSRA.

    [LSRA] isis 1 
[LSRA-isis-1] is-level level-2 
[LSRA-isis-1] network-entity 20.0010.0100.0001.00 
[LSRA-isis-1] quit 
[LSRA] interface gigabitethernet 1/0/0 
[LSRA-GigabitEthernet1/0/0] isis enable 1 
[LSRA-GigabitEthernet1/0/0] quit 
[LSRA] interface loopback 0 
[LSRA-LoopBack0] isis enable 1 
[LSRA-LoopBack0] quit

    # Configure LSRD.

    [LSRD] isis 1 
[LSRD-isis-1] network-entity 10.0010.0200.0001.00 
[LSRD-isis-1] quit 
[LSRD] interface gigabitethernet 1/0/0 
[LSRD-GigabitEthernet1/0/0] isis enable 1 
[LSRD-GigabitEthernet1/0/0] isis circuit-level level-2 
[LSRD-GigabitEthernet1/0/0] quit 
[LSRD] interface gigabitethernet 1/0/1 
[LSRD-GigabitEthernet1/0/1] isis enable 1 
[LSRD-GigabitEthernet1/0/1] isis circuit-level level-1 
[LSRD-GigabitEthernet1/0/1] quit 
[LSRD] interface gigabitethernet 2/0/0 
[LSRD-GigabitEthernet2/0/0] isis enable 1
[LSRD-GigabitEthernet2/0/0] isis circuit-level level-1 
[LSRD-GigabitEthernet2/0/0] quit 
[LSRD] interface loopback 0 
[LSRD-LoopBack0] isis enable 1 
[LSRD-LoopBack0] quit

    # Configure LSRB.

    [LSRB] isis 1 
[LSRB-isis-1] is-level level-1
[LSRB-isis-1] network-entity 10.0010.0300.0001.00
[LSRB-isis-1] quit 
[LSRB] interface gigabitethernet 1/0/0 
[LSRB-GigabitEthernet1/0/0] isis enable 1
[LSRB-GigabitEthernet1/0/0] quit 
[LSRB] interface loopback 0 
[LSRB-LoopBack0] isis enable 1
[LSRB-LoopBack0] quit

    # Configure LSRC.

    [LSRC] isis 1
[LSRC-isis-1] is-level level-1 
[LSRC-isis-1] network-entity 10.0010.0300.0002.00  
[LSRC-isis-1] quit 
[LSRC] interface gigabitethernet 1/0/0
[LSRC-GigabitEthernet1/0/0] isis enable 1 
[LSRC-GigabitEthernet1/0/0] quit 
[LSRC] interface loopback 0
[LSRC-LoopBack0] isis enable 1 
[LSRC-LoopBack0] quit

    # Run the display ip routing-table command on LSRA to check routing information.

    [LSRA] display ip routing-table
Route Flags: R - relay, D - download to fib
------------------------------------------------------------------------------
Routing Tables: Public
         Destinations : 13       Routes : 13

Destination/Mask    Proto   Pre  Cost        Flags NextHop         Interface

       10.1.0.1/32  Direct  0    0             D  127.0.0.1       LoopBack0
       10.2.0.1/32  ISIS-L2 15   10            D  10.1.1.2        GigabitEthernet1/0/0
       10.3.0.1/32  ISIS-L2 15   20            D  10.1.1.2        GigabitEthernet1/0/0
       10.3.0.2/32  ISIS-L2 15   20            D  10.1.1.2        GigabitEthernet1/0/0
       10.1.1.0/24  Direct  0    0             D  10.1.1.1        GigabitEthernet1/0/0
       10.1.1.1/32  Direct  0    0             D  127.0.0.1       GigabitEthernet1/0/0
     10.1.1.255/32  Direct  0    0             D  127.0.0.1       GigabitEthernet1/0/0
       10.2.1.0/24  ISIS-L2 15   20            D  10.1.1.2        GigabitEthernet1/0/0
       10.2.2.0/24  ISIS-L2 15   20            D  10.1.1.2        GigabitEthernet1/0/0
      127.0.0.0/8   Direct  0    0             D  127.0.0.1       InLoopBack0
      127.0.0.1/32  Direct  0    0             D  127.0.0.1       InLoopBack0
127.255.255.255/32  Direct  0    0             D  127.0.0.1       InLoopBack0  
255.255.255.255/32  Direct  0    0             D  127.0.0.1       InLoopBack0

  3. Configure a policy for generating the aggregated route.

    # Run the summary command on LSRD to aggregate host routes that are destined for LSRB and LSRC.

    [LSRD] isis 1 
[LSRD-isis-1] summary 10.3.0.0 255.255.255.0 avoid-feedback

    # Run the display ip routing-table command on LSRA to check routing information.

    [LSRA] display ip routing-table
 Route Flags: R - relay, D - download to fib
 ------------------------------------------------------------------------------
 Routing Tables: Public
         Destinations : 12       Routes : 12

 Destination/Mask    Proto   Pre  Cost        Flags NextHop         Interface

       10.1.0.1/32  Direct   0    0             D  127.0.0.1       LoopBack0
       10.2.0.1/32  ISIS-L2  15   10            D  10.1.1.2        GigabitEthernet1/0/0
    10.3.0.0/24  ISIS-L2  15   20            D  10.1.1.2        GigabitEthernet1/0/0
       10.1.1.0/24  Direct   0    0             D  10.1.1.1        GigabitEthernet1/0/0
       10.1.1.1/32  Direct   0    0             D  127.0.0.1       GigabitEthernet1/0/0
     10.1.1.255/32  Direct   0    0             D  127.0.0.1       GigabitEthernet1/0/0
       10.2.1.0/24  ISIS-L2  15   20            D  10.1.1.2        GigabitEthernet1/0/0
       10.2.2.0/24  ISIS-L2  15   20            D  10.1.1.2        GigabitEthernet1/0/0
      127.0.0.0/8   Direct   0    0             D  127.0.0.1       InLoopBack0
      127.0.0.1/32  Direct   0    0             D  127.0.0.1       InLoopBack0
127.255.255.255/32  Direct   0    0             D  127.0.0.1       InLoopBack0
255.255.255.255/32  Direct   0    0             D  127.0.0.1       InLoopBack0

    The command output shows that host routes that are destined for LSRB and LSRC are aggregated.

  4. Configure global and interface-based MPLS and MPLS LDP on each node so that the network can forward MPLS traffic. Then check the LSP setup result.

    # Configure LSRA.

    [LSRA] mpls lsr-id 10.1.0.1
[LSRA] mpls 
[LSRA-mpls] quit 
[LSRA] mpls ldp 
[LSRA-mpls-ldp] quit 
[LSRA] interface gigabitethernet 1/0/0
[LSRA-GigabitEthernet1/0/0] mpls 
[LSRA-GigabitEthernet1/0/0] mpls ldp 
[LSRA-GigabitEthernet1/0/0] quit

    # Configure LSRD.

    [LSRD] mpls lsr-id 10.2.0.1
[LSRD] mpls 
[LSRD-mpls] quit 
[LSRD] mpls ldp 
[LSRD-mpls-ldp] quit 
[LSRD] interface gigabitethernet 1/0/0
[LSRD-GigabitEthernet1/0/0] mpls 
[LSRD-GigabitEthernet1/0/0] mpls ldp 
[LSRD-GigabitEthernet1/0/0] quit
[LSRD] interface gigabitethernet 1/0/1 
[LSRD-GigabitEthernet1/0/1] mpls 
[LSRD-GigabitEthernet1/0/1] mpls ldp
[LSRD-GigabitEthernet1/0/1] quit 
[LSRD] interface gigabitethernet 2/0/0 
[LSRD-GigabitEthernet2/0/0] mpls 
[LSRD-GigabitEthernet2/0/0] mpls ldp 
[LSRD-GigabitEthernet2/0/0] quit

    # Configure LSRB.

    [LSRB] mpls lsr-id 10.3.0.1
[LSRB] mpls 
[LSRB-mpls] quit 
[LSRB] mpls ldp 
[LSRB-mpls-ldp] quit 
[LSRB] interface gigabitethernet 1/0/0
[LSRB-GigabitEthernet1/0/0] mpls 
[LSRB-GigabitEthernet1/0/0] mpls ldp 
[LSRB-GigabitEthernet1/0/0] quit

    # Configure LSRC.

    [LSRC] mpls lsr-id 10.3.0.2
[LSRC] mpls 
[LSRC-mpls] quit 
[LSRC] mpls ldp 
[LSRC-mpls-ldp] quit 
[LSRC] interface gigabitethernet 1/0/0
[LSRC-GigabitEthernet1/0/0] mpls 
[LSRC-GigabitEthernet1/0/0] mpls ldp 
[LSRC-GigabitEthernet1/0/0] quit

    # When the configurations are complete, run the display mpls lsp command on LSRA to view the established LSP.

    [LSRA] display mpls lsp 
-------------------------------------------------------------------------------
                 LSP Information: LDP LSP
-------------------------------------------------------------------------------
FEC                In/Out Label  In/Out IF                      Vrf Name
10.2.0.1/32        NULL/3        -/GE1/0/0
10.2.0.1/32        1024/3        -/GE1/0/0
10.1.0.1/32        3/NULL        -/-

    The command output shows that by default, LDP does not establish the inter-area LSPs from LSRA to LSRB and from LSRA to LSRC.

  5. Configure LDP extension for inter-area LSP.

    # Run the longest-match command on LSRA to configure LDP to search for a route according to the longest match rule to establish an inter-area LDP LSP.

    [LSRA] mpls ldp 
[LSRA-mpls-ldp] longest-match 
[LSRA-mpls-ldp] quit

  6. Verify the configuration.

    # Run the display mpls lsp command on LSRA to view the established LSP.

    [LSRA] display mpls lsp 
-------------------------------------------------------------------------------
                 LSP Information: LDP LSP
-------------------------------------------------------------------------------
FEC                In/Out Label  In/Out IF                      Vrf Name
10.2.0.1/32        NULL/3        -/GE1/0/0
10.2.0.1/32        1024/3        -/GE1/0/0
10.3.0.1/32        NULL/1025     -/GE1/0/0
10.3.0.1/32        1025/1025     -/GE1/0/0
10.3.0.2/32        NULL/1026     -/GE1/0/0
10.3.0.2/32        1026/1026     -/GE1/0/0
10.1.0.1/32        3/NULL        -/-

    The command output shows that LDP establishes the inter-area LSPs from LSRA to LSRB and from LSRA to LSRC.

Configuration Files

  • LSRA configuration file

    #
 sysname LSRA
#
mpls lsr-id 10.1.0.1
mpls
#
mpls ldp
 longest-match
#
isis 1
 is-level level-2
 network-entity 20.0010.0100.0001.00
#
interface GigabitEthernet1/0/0
 ip address 10.1.1.1 255.255.255.0
 isis enable 1
 mpls
 mpls ldp
#
interface LoopBack0
 ip address 10.1.0.1 255.255.255.255
 isis enable 1
#
return

  • LSRD configuration file

    #
 sysname LSRD
#
mpls lsr-id 10.2.0.1
mpls
#
mpls ldp
#
isis 1
 network-entity 10.0010.0200.0001.00
 summary 10.3.0.0 255.255.255.0 avoid-feedback
#
interface GigabitEthernet1/0/0
 ip address 10.1.1.2 255.255.255.0
 isis enable 1
 isis circuit-level level-2
 mpls
 mpls ldp
#
interface GigabitEthernet1/0/1
 ip address 10.2.2.1 255.255.255.0
 isis enable 1
 isis circuit-level level-1
 mpls
 mpls ldp
#
interface GigabitEthernet2/0/0
 ip address 10.2.1.1 255.255.255.0
 isis enable 1
 isis circuit-level level-1
 mpls
 mpls ldp
#
interface LoopBack0
 ip address 10.2.0.1 255.255.255.255
 isis enable 1
#
return

  • LSRB configuration file

    #
 sysname LSRB
#
mpls lsr-id 10.3.0.1
mpls
#
mpls ldp
#
isis 1
 is-level level-1
 network-entity 10.0010.0300.0001.00
#
interface GigabitEthernet1/0/0
 ip address 10.2.1.2 255.255.255.0
 isis enable 1
 mpls
 mpls ldp
#
interface LoopBack0
 ip address 10.3.0.1 255.255.255.255
 isis enable 1
#
return

  • LSRC configuration file

    #
 sysname LSRC
#
mpls lsr-id 10.3.0.2 
mpls
#
mpls ldp
#
isis 1
 is-level level-1
 network-entity 10.0010.0300.0002.00
#
interface GigabitEthernet1/0/0
 ip address 10.2.2.2 255.255.255.0
 isis enable 1
 mpls
 mpls ldp
#
interface LoopBack0
 ip address 10.3.0.2 255.255.255.255
 isis enable 1
#
return
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Updated: 2023-08-07

Document ID: EDOC1100034073

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